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bitmap.cpp
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/*
** bitmap.cpp
**
** This file is part of mkxp.
**
** Copyright (C) 2013 Jonas Kulla <[email protected]>
**
** mkxp is free software: you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation, either version 2 of the License, or
** (at your option) any later version.
**
** mkxp is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with mkxp. If not, see <http://www.gnu.org/licenses/>.
*/
#include "bitmap.h"
#include <SDL.h>
#include <SDL_image.h>
#include <SDL_ttf.h>
#include <SDL_rect.h>
#include <SDL_surface.h>
#include <pixman.h>
#include "gl-util.h"
#include "gl-meta.h"
#include "quad.h"
#include "quadarray.h"
#include "transform.h"
#include "exception.h"
#include "sharedstate.h"
#include "glstate.h"
#include "texpool.h"
#include "shader.h"
#include "filesystem.h"
#include "font.h"
#include "eventthread.h"
#ifdef __EMSCRIPTEN__
#include "emscripten.hpp"
#endif
#define GUARD_MEGA \
{ \
if (p->megaSurface) \
throw Exception(Exception::MKXPError, \
"Operation not supported for mega surfaces"); \
}
#define OUTLINE_SIZE 1
/* Normalize (= ensure width and
* height are positive) */
static IntRect normalizedRect(const IntRect &rect)
{
IntRect norm = rect;
if (norm.w < 0)
{
norm.w = -norm.w;
norm.x -= norm.w;
}
if (norm.h < 0)
{
norm.h = -norm.h;
norm.y -= norm.h;
}
return norm;
}
struct BitmapPrivate
{
Bitmap *self;
TEXFBO gl;
Font *font;
/* "Mega surfaces" are a hack to allow Tilesets to be used
* whose Bitmaps don't fit into a regular texture. They're
* kept in RAM and will throw an error if they're used in
* any context other than as Tilesets */
SDL_Surface *megaSurface;
/* A cached version of the bitmap in client memory, for
* getPixel calls. Is invalidated any time the bitmap
* is modified */
SDL_Surface *surface;
SDL_PixelFormat *format;
/* The 'tainted' area describes which parts of the
* bitmap are not cleared, ie. don't have 0 opacity.
* If we're blitting / drawing text to a cleared part
* with full opacity, we can disregard any old contents
* in the texture and blit to it directly, saving
* ourselves the expensive blending calculation */
pixman_region16_t tainted;
BitmapPrivate(Bitmap *self)
: self(self),
megaSurface(0),
surface(0)
{
format = SDL_AllocFormat(SDL_PIXELFORMAT_ABGR8888);
font = &shState->defaultFont();
pixman_region_init(&tainted);
}
~BitmapPrivate()
{
SDL_FreeFormat(format);
pixman_region_fini(&tainted);
}
void allocSurface()
{
surface = SDL_CreateRGBSurface(0, gl.width, gl.height, format->BitsPerPixel,
format->Rmask, format->Gmask,
format->Bmask, format->Amask);
}
void clearTaintedArea()
{
pixman_region_fini(&tainted);
pixman_region_init(&tainted);
}
void addTaintedArea(const IntRect &rect)
{
IntRect norm = normalizedRect(rect);
pixman_region_union_rect
(&tainted, &tainted, norm.x, norm.y, norm.w, norm.h);
}
void substractTaintedArea(const IntRect &rect)
{
if (!touchesTaintedArea(rect))
return;
pixman_region16_t m_reg;
pixman_region_init_rect(&m_reg, rect.x, rect.y, rect.w, rect.h);
pixman_region_subtract(&tainted, &m_reg, &tainted);
pixman_region_fini(&m_reg);
}
bool touchesTaintedArea(const IntRect &rect)
{
pixman_box16_t box;
box.x1 = rect.x;
box.y1 = rect.y;
box.x2 = rect.x + rect.w;
box.y2 = rect.y + rect.h;
pixman_region_overlap_t result =
pixman_region_contains_rectangle(&tainted, &box);
return result != PIXMAN_REGION_OUT;
}
void bindTexture(ShaderBase &shader)
{
TEX::bind(gl.tex);
shader.setTexSize(Vec2i(gl.width, gl.height));
}
void bindFBO()
{
FBO::bind(gl.fbo);
}
void pushSetViewport(ShaderBase &shader) const
{
glState.viewport.pushSet(IntRect(0, 0, gl.width, gl.height));
shader.applyViewportProj();
}
void popViewport() const
{
glState.viewport.pop();
}
void blitQuad(Quad &quad)
{
glState.blend.pushSet(false);
quad.draw();
glState.blend.pop();
}
void fillRect(const IntRect &rect,
const Vec4 &color)
{
bindFBO();
glState.scissorTest.pushSet(true);
glState.scissorBox.pushSet(normalizedRect(rect));
glState.clearColor.pushSet(color);
FBO::clear();
glState.clearColor.pop();
glState.scissorBox.pop();
glState.scissorTest.pop();
}
static void ensureFormat(SDL_Surface *&surf, Uint32 format)
{
if (surf->format->format == format)
return;
SDL_Surface *surfConv = SDL_ConvertSurfaceFormat(surf, format, 0);
SDL_FreeSurface(surf);
surf = surfConv;
}
void onModified(bool freeSurface = true)
{
if (surface && freeSurface)
{
SDL_FreeSurface(surface);
surface = 0;
}
self->modified();
}
};
struct BitmapOpenHandler : FileSystem::OpenHandler
{
SDL_Surface *surf;
BitmapOpenHandler()
: surf(0)
{}
bool tryRead(SDL_RWops &ops, const char *ext, const char * fullPath)
{
#ifdef __EMSCRIPTEN__
surf = IMG_Load(fullPath);
#else
surf = IMG_LoadTyped_RW(&ops, 1, ext);
#endif
return surf != 0;
}
};
Bitmap::Bitmap(const char *filename)
{
strcpy(this->filename, filename);
this->loadFromFilename();
}
void Bitmap::loadFromFilename()
{
char * filename = this->filename;
#ifdef __EMSCRIPTEN__
bool reloading = false;
if (this->p) {
this->releaseResources();
reloading = true;
} else {
load_file_async_js(filename, (int)this);
}
#endif
BitmapOpenHandler handler;
shState->fileSystem().openRead(handler, filename);
SDL_Surface *imgSurf = handler.surf;
if (!imgSurf) {
printf("Error occured loading image %s : %s\n", filename, SDL_GetError());
throw Exception(Exception::SDLError, "Error loading image '%s': %s",
filename, SDL_GetError());
}
p->ensureFormat(imgSurf, SDL_PIXELFORMAT_ABGR8888);
if (imgSurf->w > glState.caps.maxTexSize || imgSurf->h > glState.caps.maxTexSize)
{
/* Mega surface */
p = new BitmapPrivate(this);
p->megaSurface = imgSurf;
SDL_SetSurfaceBlendMode(p->megaSurface, SDL_BLENDMODE_NONE);
}
else
{
/* Regular surface */
TEXFBO tex;
try
{
tex = shState->texPool().request(imgSurf->w, imgSurf->h);
}
catch (const Exception &e)
{
SDL_FreeSurface(imgSurf);
throw e;
}
p = new BitmapPrivate(this);
p->gl = tex;
TEX::bind(p->gl.tex);
TEX::uploadImage(p->gl.width, p->gl.height, imgSurf->pixels, GL_RGBA);
SDL_FreeSurface(imgSurf);
}
p->addTaintedArea(rect());
#ifdef __EMSCRIPTEN__
if (reloading && this->reloadCallback)
this->reloadCallback(this->reloadCallbackData);
#endif
}
Bitmap::Bitmap(int width, int height)
{
if (width <= 0 || height <= 0)
throw Exception(Exception::RGSSError, "failed to create bitmap");
TEXFBO tex = shState->texPool().request(width, height);
p = new BitmapPrivate(this);
p->gl = tex;
clear();
}
Bitmap::Bitmap(const Bitmap &other)
{
other.ensureNonMega();
p = new BitmapPrivate(this);
p->gl = shState->texPool().request(other.width(), other.height());
blt(0, 0, other, rect());
}
Bitmap::~Bitmap()
{
dispose();
}
int Bitmap::width() const
{
guardDisposed();
if (p->megaSurface)
return p->megaSurface->w;
return p->gl.width;
}
int Bitmap::height() const
{
guardDisposed();
if (p->megaSurface)
return p->megaSurface->h;
return p->gl.height;
}
IntRect Bitmap::rect() const
{
guardDisposed();
return IntRect(0, 0, width(), height());
}
void Bitmap::blt(int x, int y,
const Bitmap &source, IntRect rect,
int opacity)
{
if (source.isDisposed())
return;
// FIXME: RGSS allows the source rect to both lie outside
// the bitmap rect and be inverted in both directions;
// clamping only covers a subset of these cases (and
// doesn't fix anything for a direct stretch_blt call).
/* Clamp rect to source bitmap size */
if (rect.x + rect.w > source.width())
rect.w = source.width() - rect.x;
if (rect.y + rect.h > source.height())
rect.h = source.height() - rect.y;
stretchBlt(IntRect(x, y, rect.w, rect.h),
source, rect, opacity);
}
void Bitmap::stretchBlt(const IntRect &destRect,
const Bitmap &source, const IntRect &sourceRect,
int opacity)
{
guardDisposed();
GUARD_MEGA;
if (source.isDisposed())
return;
opacity = clamp(opacity, 0, 255);
if (opacity == 0)
return;
#if __EMSCRIPTEN__
if (strlen(source.filename) > 0 && !file_is_cached(source.filename)) {
load_file_async_js(source.filename);
((Bitmap*)(&source))->loadFromFilename();
}
#endif
SDL_Surface *srcSurf = source.megaSurface();
if (srcSurf && shState->config().subImageFix)
{
/* Blit from software surface, for broken GL drivers */
Vec2i gpTexSize;
shState->ensureTexSize(sourceRect.w, sourceRect.h, gpTexSize);
shState->bindTex();
GLMeta::subRectImageUpload(srcSurf->w, sourceRect.x, sourceRect.y, 0, 0,
sourceRect.w, sourceRect.h, srcSurf, GL_RGBA);
GLMeta::subRectImageEnd();
SimpleShader &shader = shState->shaders().simple;
shader.bind();
shader.setTranslation(Vec2i());
shader.setTexSize(gpTexSize);
p->pushSetViewport(shader);
p->bindFBO();
Quad &quad = shState->gpQuad();
quad.setTexRect(FloatRect(0, 0, sourceRect.w, sourceRect.h));
quad.setPosRect(destRect);
p->blitQuad(quad);
p->popViewport();
p->addTaintedArea(destRect);
p->onModified();
return;
}
else if (srcSurf)
{
/* Blit from software surface */
/* Don't do transparent blits for now */
if (opacity < 255)
source.ensureNonMega();
SDL_Rect srcRect = sourceRect;
SDL_Rect dstRect = destRect;
SDL_Rect btmRect = { 0, 0, width(), height() };
SDL_Rect bltRect;
if (SDL_IntersectRect(&btmRect, &dstRect, &bltRect) != SDL_TRUE)
return;
int bpp;
Uint32 rMask, gMask, bMask, aMask;
SDL_PixelFormatEnumToMasks(SDL_PIXELFORMAT_ABGR8888,
&bpp, &rMask, &gMask, &bMask, &aMask);
SDL_Surface *blitTemp =
SDL_CreateRGBSurface(0, destRect.w, destRect.h, bpp, rMask, gMask, bMask, aMask);
SDL_BlitScaled(srcSurf, &srcRect, blitTemp, 0);
TEX::bind(p->gl.tex);
if (bltRect.w == dstRect.w && bltRect.h == dstRect.h)
{
/* Dest rectangle lies within bounding box */
TEX::uploadSubImage(destRect.x, destRect.y,
destRect.w, destRect.h,
blitTemp->pixels, GL_RGBA);
}
else
{
/* Clipped blit */
GLMeta::subRectImageUpload(blitTemp->w, bltRect.x - dstRect.x, bltRect.y - dstRect.y,
bltRect.x, bltRect.y, bltRect.w, bltRect.h, blitTemp, GL_RGBA);
GLMeta::subRectImageEnd();
}
SDL_FreeSurface(blitTemp);
p->onModified();
return;
}
if (opacity == 255 && !p->touchesTaintedArea(destRect))
{
/* Fast blit */
GLMeta::blitBegin(p->gl);
GLMeta::blitSource(source.p->gl);
GLMeta::blitRectangle(sourceRect, destRect);
GLMeta::blitEnd();
}
else
{
/* Fragment pipeline */
float normOpacity = (float) opacity / 255.0f;
TEXFBO &gpTex = shState->gpTexFBO(destRect.w, destRect.h);
GLMeta::blitBegin(gpTex);
GLMeta::blitSource(p->gl);
GLMeta::blitRectangle(destRect, Vec2i());
GLMeta::blitEnd();
FloatRect bltSubRect((float) sourceRect.x / source.width(),
(float) sourceRect.y / source.height(),
((float) source.width() / sourceRect.w) * ((float) destRect.w / gpTex.width),
((float) source.height() / sourceRect.h) * ((float) destRect.h / gpTex.height));
BltShader &shader = shState->shaders().blt;
shader.bind();
shader.setDestination(gpTex.tex);
shader.setSubRect(bltSubRect);
shader.setOpacity(normOpacity);
Quad &quad = shState->gpQuad();
quad.setTexPosRect(sourceRect, destRect);
quad.setColor(Vec4(1, 1, 1, normOpacity));
source.p->bindTexture(shader);
p->bindFBO();
p->pushSetViewport(shader);
p->blitQuad(quad);
p->popViewport();
}
p->addTaintedArea(destRect);
p->onModified();
}
void Bitmap::fillRect(int x, int y,
int width, int height,
const Vec4 &color)
{
fillRect(IntRect(x, y, width, height), color);
}
void Bitmap::fillRect(const IntRect &rect, const Vec4 &color)
{
guardDisposed();
GUARD_MEGA;
p->fillRect(rect, color);
if (color.w == 0)
/* Clear op */
p->substractTaintedArea(rect);
else
/* Fill op */
p->addTaintedArea(rect);
p->onModified();
}
void Bitmap::gradientFillRect(int x, int y,
int width, int height,
const Vec4 &color1, const Vec4 &color2,
bool vertical)
{
gradientFillRect(IntRect(x, y, width, height), color1, color2, vertical);
}
void Bitmap::gradientFillRect(const IntRect &rect,
const Vec4 &color1, const Vec4 &color2,
bool vertical)
{
guardDisposed();
GUARD_MEGA;
SimpleColorShader &shader = shState->shaders().simpleColor;
shader.bind();
shader.setTranslation(Vec2i());
Quad &quad = shState->gpQuad();
if (vertical)
{
quad.vert[0].color = color1;
quad.vert[1].color = color1;
quad.vert[2].color = color2;
quad.vert[3].color = color2;
}
else
{
quad.vert[0].color = color1;
quad.vert[3].color = color1;
quad.vert[1].color = color2;
quad.vert[2].color = color2;
}
quad.setPosRect(rect);
p->bindFBO();
p->pushSetViewport(shader);
p->blitQuad(quad);
p->popViewport();
p->addTaintedArea(rect);
p->onModified();
}
void Bitmap::clearRect(int x, int y, int width, int height)
{
clearRect(IntRect(x, y, width, height));
}
void Bitmap::clearRect(const IntRect &rect)
{
guardDisposed();
GUARD_MEGA;
p->fillRect(rect, Vec4());
p->onModified();
}
void Bitmap::blur()
{
guardDisposed();
GUARD_MEGA;
Quad &quad = shState->gpQuad();
FloatRect rect(0, 0, width(), height());
quad.setTexPosRect(rect, rect);
TEXFBO auxTex = shState->texPool().request(width(), height());
BlurShader &shader = shState->shaders().blur;
BlurShader::HPass &pass1 = shader.pass1;
BlurShader::VPass &pass2 = shader.pass2;
glState.blend.pushSet(false);
glState.viewport.pushSet(IntRect(0, 0, width(), height()));
TEX::bind(p->gl.tex);
FBO::bind(auxTex.fbo);
pass1.bind();
pass1.setTexSize(Vec2i(width(), height()));
pass1.applyViewportProj();
quad.draw();
TEX::bind(auxTex.tex);
p->bindFBO();
pass2.bind();
pass2.setTexSize(Vec2i(width(), height()));
pass2.applyViewportProj();
quad.draw();
glState.viewport.pop();
glState.blend.pop();
shState->texPool().release(auxTex);
p->onModified();
}
void Bitmap::radialBlur(int angle, int divisions)
{
guardDisposed();
GUARD_MEGA;
angle = clamp<int>(angle, 0, 359);
divisions = clamp<int>(divisions, 2, 100);
const int _width = width();
const int _height = height();
float angleStep = (float) angle / (divisions-1);
float opacity = 1.0f / divisions;
float baseAngle = -((float) angle / 2);
ColorQuadArray qArray;
qArray.resize(5);
std::vector<Vertex> &vert = qArray.vertices;
int i = 0;
/* Center */
FloatRect texRect(0, 0, _width, _height);
FloatRect posRect(0, 0, _width, _height);
i += Quad::setTexPosRect(&vert[i*4], texRect, posRect);
/* Upper */
posRect = FloatRect(0, 0, _width, -_height);
i += Quad::setTexPosRect(&vert[i*4], texRect, posRect);
/* Lower */
posRect = FloatRect(0, _height*2, _width, -_height);
i += Quad::setTexPosRect(&vert[i*4], texRect, posRect);
/* Left */
posRect = FloatRect(0, 0, -_width, _height);
i += Quad::setTexPosRect(&vert[i*4], texRect, posRect);
/* Right */
posRect = FloatRect(_width*2, 0, -_width, _height);
i += Quad::setTexPosRect(&vert[i*4], texRect, posRect);
for (int i = 0; i < 4*5; ++i)
vert[i].color = Vec4(1, 1, 1, opacity);
qArray.commit();
TEXFBO newTex = shState->texPool().request(_width, _height);
FBO::bind(newTex.fbo);
glState.clearColor.pushSet(Vec4());
FBO::clear();
Transform trans;
trans.setOrigin(Vec2(_width / 2.0f, _height / 2.0f));
trans.setPosition(Vec2(_width / 2.0f, _height / 2.0f));
glState.blendMode.pushSet(BlendAddition);
SimpleMatrixShader &shader = shState->shaders().simpleMatrix;
shader.bind();
p->bindTexture(shader);
TEX::setSmooth(true);
p->pushSetViewport(shader);
for (int i = 0; i < divisions; ++i)
{
trans.setRotation(baseAngle + i*angleStep);
shader.setMatrix(trans.getMatrix());
qArray.draw();
}
p->popViewport();
TEX::setSmooth(false);
glState.blendMode.pop();
glState.clearColor.pop();
shState->texPool().release(p->gl);
p->gl = newTex;
p->onModified();
}
void Bitmap::clear()
{
guardDisposed();
GUARD_MEGA;
p->bindFBO();
glState.clearColor.pushSet(Vec4());
FBO::clear();
glState.clearColor.pop();
p->clearTaintedArea();
p->onModified();
}
static uint32_t &getPixelAt(SDL_Surface *surf, SDL_PixelFormat *form, int x, int y)
{
size_t offset = x*form->BytesPerPixel + y*surf->pitch;
uint8_t *bytes = (uint8_t*) surf->pixels + offset;
return *((uint32_t*) bytes);
}
Color Bitmap::getPixel(int x, int y) const
{
guardDisposed();
GUARD_MEGA;
if (x < 0 || y < 0 || x >= width() || y >= height())
return Vec4();
if (!p->surface)
{
p->allocSurface();
FBO::bind(p->gl.fbo);
glState.viewport.pushSet(IntRect(0, 0, width(), height()));
gl.ReadPixels(0, 0, width(), height(), GL_RGBA, GL_UNSIGNED_BYTE, p->surface->pixels);
glState.viewport.pop();
}
uint32_t pixel = getPixelAt(p->surface, p->format, x, y);
return Color((pixel >> p->format->Rshift) & 0xFF,
(pixel >> p->format->Gshift) & 0xFF,
(pixel >> p->format->Bshift) & 0xFF,
(pixel >> p->format->Ashift) & 0xFF);
}
void Bitmap::setPixel(int x, int y, const Color &color)
{
guardDisposed();
GUARD_MEGA;
uint8_t pixel[] =
{
(uint8_t) clamp<double>(color.red, 0, 255),
(uint8_t) clamp<double>(color.green, 0, 255),
(uint8_t) clamp<double>(color.blue, 0, 255),
(uint8_t) clamp<double>(color.alpha, 0, 255)
};
TEX::bind(p->gl.tex);
TEX::uploadSubImage(x, y, 1, 1, &pixel, GL_RGBA);
p->addTaintedArea(IntRect(x, y, 1, 1));
/* Setting just a single pixel is no reason to throw away the
* whole cached surface; we can just apply the same change */
if (p->surface)
{
uint32_t &surfPixel = getPixelAt(p->surface, p->format, x, y);
surfPixel = SDL_MapRGBA(p->format, pixel[0], pixel[1], pixel[2], pixel[3]);
}
p->onModified(false);
}
void Bitmap::hueChange(int hue)
{
guardDisposed();
GUARD_MEGA;
if ((hue % 360) == 0)
return;
TEXFBO newTex = shState->texPool().request(width(), height());
FloatRect texRect(rect());
Quad &quad = shState->gpQuad();
quad.setTexPosRect(texRect, texRect);
quad.setColor(Vec4(1, 1, 1, 1));
HueShader &shader = shState->shaders().hue;
shader.bind();
/* Shader expects normalized value */
shader.setHueAdjust(wrapRange(hue, 0, 359) / 360.0f);
FBO::bind(newTex.fbo);
p->pushSetViewport(shader);
p->bindTexture(shader);
p->blitQuad(quad);
p->popViewport();
TEX::unbind();
shState->texPool().release(p->gl);
p->gl = newTex;
p->onModified();
}
void Bitmap::drawText(int x, int y,
int width, int height,
const char *str, int align)
{
drawText(IntRect(x, y, width, height), str, align);
}
static std::string fixupString(const char *str)
{
std::string s(str);
/* RMXP actually draws LF as a "missing gylph" box,
* but since we might have accidentally converted CRs
* to LFs when editing scripts on a Unix OS, treat them
* as white space too */
for (size_t i = 0; i < s.size(); ++i)
if (s[i] == '\r' || s[i] == '\n')
s[i] = ' ';
return s;
}
static void applyShadow(SDL_Surface *&in, const SDL_PixelFormat &fm, const SDL_Color &c)
{
SDL_Surface *out = SDL_CreateRGBSurface
(0, in->w+1, in->h+1, fm.BitsPerPixel, fm.Rmask, fm.Gmask, fm.Bmask, fm.Amask);
float fr = c.r / 255.0f;
float fg = c.g / 255.0f;
float fb = c.b / 255.0f;
/* We allocate an output surface one pixel wider and higher than the input,
* (implicitly) blit a copy of the input with RGB values set to black into
* it with x/y offset by 1, then blend the input surface over it at origin
* (0,0) using the bitmap blit equation (see shader/bitmapBlit.frag) */
for (int y = 0; y < in->h+1; ++y)
for (int x = 0; x < in->w+1; ++x)
{
/* src: input pixel, shd: shadow pixel */
uint32_t src = 0, shd = 0;
/* Output pixel location */
uint32_t *outP = ((uint32_t*) ((uint8_t*) out->pixels + y*out->pitch)) + x;
if (y < in->h && x < in->w)
src = ((uint32_t*) ((uint8_t*) in->pixels + y*in->pitch))[x];
if (y > 0 && x > 0)
shd = ((uint32_t*) ((uint8_t*) in->pixels + (y-1)*in->pitch))[x-1];
/* Set shadow pixel RGB values to 0 (black) */
shd &= fm.Amask;
if (x == 0 || y == 0)
{
*outP = src;
continue;
}
if (x == in->w || y == in->h)
{
*outP = shd;
continue;
}
/* Input and shadow alpha values */
uint8_t srcA, shdA;
srcA = (src & fm.Amask) >> fm.Ashift;
shdA = (shd & fm.Amask) >> fm.Ashift;
if (srcA == 255 || shdA == 0)
{
*outP = src;
continue;
}
if (srcA == 0 && shdA == 0)
{
*outP = 0;
continue;
}